Spring-hinge



(ModeL) v J. KEENE.

' SPRING HINGE. No. 361,701. Patented Apr. 26, 1887.

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JOSEPH KEENE, OF CHICAGO, ILLINOIS.

SPRING-HINGE.

SPECIFICATION forming part of Letters f'atent No. 361,701, dated April 26, 1887.

Application filed January 15, 1887. Serial Noflgt lflfi. (Modem T0 to whmn it may concern.-

Be it known that I, J OSEPH KEENE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Spring-Hinges; and Ido declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention has for its object to provide a novel and simplified construction in a doubleacting spring door-hinge; and it consists in the .construction and arrangement of the bearingloops formed upon the hinge plates or leaves of a spring, both ends of which are formed into hooks, of a central shaft or bolt having rigidly secured upon one end a cam dog or lug and the opposite end thereof provided with a shank for receivinga movable cam-dog, and novel details in the construction of the same for locking and releasing the said movable cam-dog upon the central shaft, as will be hereinafter fully described.

In the accompanying drawings, in which corresponding parts are indicated by similar letters, Figure 1 is a front elevation of the hinge in a complete form. Fig. 2is a vertical section of the same. Fig. 3is avdet-ail view of the central shaft or pin detached, with one cam or dog attached thereto; and Fig. 4 isa detail view in section, representing the manner in which the movable cam or dog is fixed to the central shaft.

Referring to the drawings, A represents the hinge plates or leaves,which are connected together by center bearings, a, which project from the same in such a manner that they can be easily attached and detached in applying the required parts of the hinge, as shown. The inner margin of each hinge-plate is formed with two bearing-loops, I) 1), near each end adjacent to the center bearings, said bearingloops projecting somewhat outward and having rounded portion or hearing.

Upon one end of each hinge-plate is cast a lug, a,which strikes a projection formed upon the opposite plate, to greatly facilitate in applying the hinge to a door, by which means the leaves will always remain in a vertical .plane with each other.

B represents the coil-spring, having its terminal ends 12 formed into hooks for receiving diagonally-opposite loops of the hinge plates or leaves, by means of which the spring is held against its tension. A central shaft or bolt, 0, extends through the coil-spring, and has secured thereto the movable cam-dog D and rigid one, D, which are adapted to engage the bearing-loops of the hinge-leaves directly opposite to those engaged by the terminal ends of the spring.

The removable cam-dog D is provided with a collar, d,having a groove out upon its inner circumference and leading to an annular channel or recess, d, which receives the key 0, secured upon the shank or bearing of the shaft C. By this construction the parts of the hinge can be readily separated and assembled together, and also perform a mechanical operation in the working of the hinge.

In carrying out my invention, it will be observed that when the hinge plates or leaves are closed toward each other the spring held against its tension shifts inward from the pivotal or axial line of the hinge-plates, this eccentric position being increased as the hingeplates are brought nearer together until the loop-bearings of the hinge-plates are carried around forward of the axial line of the center bearing of the hinge-plates. In this position the action of the spring through the terminal ends is reversed, while before, the spring being in a central position opened to force the hinge-plates open; now the spring being in an eccentric position operates to draw the hingeplates toward each other. In each of these movements the operation of the spring is actuated directly upon the hinge-plates, and on account of the sliding motion on the loopbearings renders the action of the hinge easy and smooth,preventing the harshness and sudden jerks which would accompany a more positive and rigid connection. The action of the spring is moderated and equalized or softened without detracting from its effective force.

From the foregoing description it will also be observed that the spring can be made much cheaper than the ones commonly in use, avoiding the use of auxiliary cams or dogs, to which the spring is generally attached, but, upon the other hand, securing the spring directly to the leaves of the hinge, and havinga central shaft for carrying one movable and one rigid cam or dog, by which construction the spring will be thrown inwardly instead of outwardly, as is the case generally in other spring-hinges.

It may be well to state that by this eccentric movement a more direct and positive tension of the spring is effected, and it also occupies less space when the leaves are closed.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, 1s-- In a double-acting spring doorhinge, the combination of the coil-spring B, having the hook ends I) for receiving the loops of the hinge-plates, the central shaft or bolt, 0, having secured thereto the cam-dog D, the movable cam-dog D, provided with the collar 01 and i having a groove out upon its inner circumfer- 2o 

